<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>写一个异步定时</title>
</head>
<body>
    <script type="text/javascript">
        
        setTimeout(() => {
            console.log('我是一个异步定时任务')
        }, 1000);
    </script>
</body>
</html>